Hi, this question is might silly question,

I`ve set X button for A/T disengage switch.,and When I disengage that, The only A/T supposed to be disengaged but even A/T Arm switch is being disconneted.also I`m using 744 and 777, both of them works well but not only for 737. Do u have any solution for this problem?

It's just as it works on a real 737. On 747-777 A/T soft disengage doesn't disarm A/T.